package com.meirengu.utils;

import javax.servlet.http.HttpServletRequest;

import static org.apache.commons.lang3.StringUtils.isNotEmpty;

public class RequestUtil {

    /**
     * 获得请求的ip地址
     *
     * @param request
     * @return
     */
    public static String getClientIp(HttpServletRequest request) {
        String ip = request.getHeader("X-Real-IP");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("x-forwarded-for");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }

        //取第一个ip，为用户的真实ip
        if (isNotEmpty(ip)) {
            int index;
            if ((index = ip.indexOf(",")) != -1) {
                ip = ip.substring(0, index);
            }
        }

        return ip;
    }

    public static String getIpAddr(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("http_client_ip");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        // 如果是多级代理，那么取第一个ip为客户ip
        if (isNotEmpty(ip)) {
            int index;
            if ((index = ip.indexOf(",")) != -1) {
                ip = ip.substring(0, index);
            }
        }

        return ip;
    }
}
